Send as alias in Office 365 using Outlook 20165/5 (1)

Although it is possible to assign many email aliases to a single account in Office 365 it is not easy to send as an alias using Outlook when composing a new email.

There are two workarounds to this, the first is to use a distribution group and assign users permissions to send from that distribution group. The second, which is the method documented in this post is to set-up a second mail account within Outlook and use the account to send mail via the Office 365 SMTP servers. This will give you the ability to select the alias using the “From” button when composing a new email.

How to setup Outlook to send from an alias in Office 365

The idea behind this method is to setup a second account in Outlook that will allow sending from an alias that has been defined in Office 365. It would be better if the ability to send as an alias was native to Outlook/Office 365, but it isn’t. See these instructions for how to add an alias with Powershell.

Before you can proceed, you need to find your SMTP settings: To do this, login to Outlook Web App, click on the little cog in the top right of the screen to bring up the options menu and click on options.

Login to Outlook Web App

Click the settings cog in the top right corner

In the search box at the top of the settings window, type in “pop”:

Click on POP and IMAP

This will show you the settings you need for POP, IMAP and SMTP access. We only need the SMTP setting:

I expect your settings will be the same as mine, which means your Office 365 SMTP Server will be smtp.office365.com. Before proceeding ensure you have added the alias that you want to send from to your Office 365 account.

Setup Outlook 2016 to send from an email alias

Go to “File” and then “Account Settings”. Click the “Account settings” button and choose “Account Settings”:

This will bring up the list of your accounts, click new:

Recent versions of Outlook 2016 may show a “Simplified Account Creation Screen”, which makes this process much more difficult:

Click on the “Advanced” tab and then change the “Outgoing Server (SMTP)” setting to 587 and the encryption type to “TLS”.

Click OK to return to the previous screen and then click next to add the account. On the next screen click finish.

When the account was created Outlook created a new PST file for the new account. We don’t need that as we are not going to be receiving any emails on this account. You should now be back at the E-Mail accounts screen. Click on your new account to highlight it and then click on “Change Folder” option.

Select your inbox from your main Exchange account. Click OK and then Close. The new PST file will still be in your folder list, but you can remove it by right clicking on it and choosing close.

Now your account is set-up and you will be able to send email from this address by simply selecting the from address when composing a new email.

Although you are now in a position to send emails using this address there is one additional step to ensure that Outlook does not attempt to receive email.Click on the “Send / Receive” tab and then click on “Define Send/Receive groups”In the Send/Receive Groups settings, click on “Edit”. Select your newly created account and untick the box which says “Include the selected account in this group”. Like the following picture:

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I have been looking around for ages trying to resolve this issue. So thanks!

The only modification to your instructions is that in Outlook 2013 you do not have the option to close the account, you can only remove it and is will delete the email account you have just created.

So what you need to do is access your “Accounts Settings” windows (FILE > ACCOUNTS SETTINGS) and then click on the “Data Files” tab from here just delete the .pst file relating to the newly created email account. MAKE SURE YOU DON’T DELETE THE WRONG DATA FILE. When you go back to your folders you will see the account has disappeared, but you can still send from that email address.

Thanks so much! This is the solution I’ve been looking for for a long time!

@James: If you get the error “550 5.7.1 Client does not have permissions to send as this sender”, just use the smtp-server of your other mail provider (eg. smtp.mail.yahoo.com) instead of the smtp.office365.com. Then it should be fine.

@Mike: Just go the account settings and set your POP account you use for sending as your default account. Then this reply address will be preselected.

This method is useful, the annoyance I have with it is that sent items are put into the PST file of the dummy account by default. If you go into account settings and highlight the dummy account, look for the “selected account delivers new messages to the following location” – press the “change folder” button and select the inbox of your Exchange account – this actually affects where your sent items are stored. You can now close the dummy PST file which was created when opening the account. Hope this helps someone.

I’m using Office 365 and after clicking on ‘options’ (via Outlook > little cog) I don’t see the same list of options. Under Account, I only see Bloc or allow; Connected Accounts; Forwarding; and POP and IMAP.

Any help greatly appreciated; like most, as a small business, I really need to be able to send from multiple email aliases. Surprised MS are making this so difficult, doesn’t really feel like they’ve thought much about the needs of this market.

I thought so, these directions will certainly not work in OWA and I don’t believe it is possible to do from OWA. However if you also have Outlook 2013 then you should be able to follow these instructions quite accurately. I don’t really have any explanation as to why you wouldn’t see these options.

YES you can send from an alias. First make sure the alias email is listed under the user in the admin center, users, active users. Is it listed for that user, if no, add it, if yes, next.
In OWA:
click on new mail, click on the little dots next to Discard and show from
In the “from” drop down, you will only have your email address, right click and remove it, then type in the alias email address.
Send a test message. When you send from the alias email address once it will now show up in your drop downs for from.

Same for Outlook
Click on new mail, Options, and show From (if you do not see the “from” field).
Once you see the “from” field, arrow drop down, if you do not see the alias email address, click on other email address add it.

Did all the above, all seemed to work correctly but now I have outlook prompting for my password and it won’t accept it (even though i’m already logged into outlook with the same password) It keeps re-prompting for it over an over and won’t send the mail under the new alias and i can’t get it to stop (can send mail find ounder the primary alias). Even closing out outlook then re-opening it, it still keeps prompting for a password to send the mail I tried to send under the different alias.

I added everything like in this instruction, but when i tried to send test message from 2nd domain (Alias) to myself i can see it was send from my 1st domain (Main address).
The same when I send test mal to my colleague from the same domain – in outlook there is shown y main address.
But when ilve send mail to my private Gmail account i can see it was send from domain.
Could you tell me what is the clue of this issue?

However, when I send from my outlook app (windows), the emails do not seem to go out and they still seem to come from my primary account (in my automatic BCC).

I’ll try to lay out the three options I tried with enough detail for assistance.

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After following all of the setup instructions, and then double checking them, I am sending an email out using the “from” button in my Outlook 2016 app (windows) using the [email protected] account and sending to [email protected] as the test recipient.

Outlook immediately reflects the BCC copy of the email in my inbox, but the email does NOT seem to go out and is NOT received at [email protected].

I also tried one of the other ideas in the comments like simply using “other email address” in the from field from Outlook app with the option “send using [email protected]“. The result with this method is that the email DOES go out and IS received at [email protected], but shows as coming from [email protected] rather than [email protected].